Alessio, a homosexual ex-dancer and now framer, has raised the young Mimmina as a daughter, abandoned by her father at an early age. Despite the commitment to make the girl a honest woman in her own way, Mimmina reveals a complete moral ruthlessness that leads her to prison for an attempted abortion, at the time still illegal. In the hope of somehow benefiting the young woman, whom he is sincerely fond of, Alessio is forced to accept the proposal of an ambiguous commissioner and becomes a police informer. Thanks to his confidences, the police manage to thwart drug trafficking, fake paintings and pornographic photos, but Alessio is soon abandoned by all the friends who have discovered his activity as an informer. Decided to move to another city, Alessio falls victim of the revenge of the underworld on the eve of his departure.
